JPH0420721A - Heat cooking apparatus - Google Patents

Abstract

PURPOSE:To provide a heat cooking device which can uniformly heat an object being cooked and prevent nonuniformity of grilling as much as possible by increasing the number of turns of heating wire of plane heater. CONSTITUTION:In a plane heater 4, the number of turns of heating wire 12 on a front heating element 9 is higher than that of heating wire 14 on a rear heating element 10. The heating wire 12 on the front heating element 9 is connected in series to the heating wire 14 on the rear heating element 10. Thus, the plane heater 4 is so constructed that the number of turns of heating wires 12, 14 increases at the front side or the door side. Therefore, though the degree of heat dissipation is higher at the front side or door side because the front opening of heat cooking chamber is closed with a door, the quantities of heat remaining at the front and rear sides in the heat cooking chamber are nearly equal. As a result, the temperature distribution in the heat cooking chamber becomes almost uniform, enabling substantially uniform heating of an object being cooked which has been put in the heat cooking chamber and preventing nonuniformity of grilling as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a cooking device equipped with a heating cooking chamber having a door that opens and closes a front opening.

(Prior Art) Some heating cookers of this type have a planar heater disposed on the inner bottom surface of a cooking chamber, and the food to be cooked is heated by the planar heater. The above-mentioned planar heater is constructed by winding a heating wire around, for example, a mica plate as an insulating substrate. With this configuration, heat is radiated almost uniformly from the planar heater into the cooking chamber.

(Problems to be Solved by the Invention) In the above conventional configuration, when cooking, the front opening of the cooking chamber is closed by a door, but the heat insulation performance of the door and the heat insulation performance of the wall of the cooking chamber are different. Therefore, the degree of heat radiation is different between the front side and the rear side of the heating cooking chamber, and the degree of heat radiation is greater on the front side, that is, on the door side. For this reason, the temperature at the front side of the heating cooking chamber tends to drop, and the food to be cooked becomes unevenly heated, resulting in uneven cooking. Particularly when toasting is being done, the cooking time is short, which makes the toasting even more uneven.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cooking device that can uniformly heat food and prevent uneven cooking as much as possible.

[Structure of the Invention] (Means for Solving the Problems) The heating cooking device of the present invention includes a heating cooking chamber having a door that opens and closes a front opening, and a heating cooking chamber arranged along the front-back direction on the inner surface of the heating cooking chamber. A heating cooker comprising a planar heater configured by winding a heating wire around an insulating substrate, wherein the planar heater is characterized in that the number of turns of the heating wire is greater on the door side. has.

(Function) According to the above means, in the planar heater, since the number of turns of the heating wire is increased on the door side, the amount of heat generated on the door side is increased.

For this reason, during cooking, even if the front opening of the cooking chamber is closed with a door, so that the degree of heat dissipation from the front side, that is, the door side, is large, residual heat remains on the front and rear sides of the cooking chamber. The amount of heat generated becomes approximately equal, and as a result, the temperature distribution within the cooking chamber becomes approximately uniform, making it possible to prevent uneven cooking as much as possible.

(Example) Hereinafter, an example in which the present invention is applied to a cooking device having a high frequency heating function will be described with reference to the drawings.

First, in FIG. 3, a motor 1 for rotating a shelf is disposed at the bottom of a heating cooking chamber (not shown) having an opening on the front surface. A rotating shelf 3 is located at the upper end of the rotating shaft 2 of this motor 1.
are removably connected to each other, and this rotary shelf 3 is connected to the motor 1.
It is designed to be rotationally driven by. Above rotating shelf 3
A planar heater 4 is mounted and fixed on a mounting plate 5 via a heat insulating member 6 below. Thereby, the planar heater 4 is disposed along the front-rear direction, for example, on the bottom surface of the inner surface of the heating cooking chamber. Further, the heating cooking chamber is rotatably provided with a door (not shown) that opens and closes the front opening thereof. The planar heater 4 will be described in detail below with reference to FIGS. 1 and 2.

The planar heater 4 has a front heating element 9 and a rear heating element 1 between a lower cover 7 made of mica and an upper cover 8 also made of mica.
It is composed of 0 in between. The front heating element 9 is constructed by winding a heating wire 12 made of nichrome wire or the like around an insulating substrate, such as a mica plate 11. Similarly, the rear heating element 0 is constructed by winding a heating wire 4 made of nichrome wire or the like around an insulating substrate, for example, a mica plate 13.

Here, the number of turns of the heating wire 12 of the front heating element 9 is set to be greater than the number of turns of the heating wire 14 of the rear heating element 10. The heating wire 12 of the front heating element 9 is
It is connected in series to the heating wire 14 of the rear heating element 10.

Thereby, the planar heater 4 is configured such that the number of turns of the heating wire 12, 14 increases on the front side, that is, on the door side.

A through hole] 5 is formed in the center of the planar heater 4, and the rotation shaft 2 of the motor 1 is inserted into the through hole 15.
is inserted.

According to the above configuration, in the planar heater 4, the number of turns of the heating wire 12, 14 is increased on the door side, so that the amount of heat generated on the door side is increased. For this reason, during cooking, even if the front opening of the cooking chamber is closed with a door, so that the degree of heat dissipation from the front side, that is, the door side, is large, residual heat remains on the front and rear sides of the cooking chamber. The amount of heat produced is almost the same. As a result, the temperature distribution in the heating cooking chamber becomes almost uniform, so that the food stored in the heating cooking chamber is heated almost uniformly, and uneven cooking can be prevented as much as possible.

Further, in the above embodiment, two heating elements 9 having different calorific values are used.
．． When manufacturing the heating wire 10, the heating wires 12 and 14 of the same diameter and the same material are simply changed in the number of turns, so manufacturing is simple and the cost is low.

In the above embodiment, the heating wire 12.14 is wound around the mica plate 11.13 by being folded back in the front-rear direction, but instead of this, the heating wire 12.14 is wound around the mica plate 11.13 by being folded back in the left-right direction. It may also be used as a configuration. Further, in the above embodiment, two heating elements 9 and 10 are provided, but the present invention is not limited to this, and one or three or more heating elements may be provided. Here, when three or more heating elements are provided, the number of turns of the heating wire of the heating element placed on the door side may be increased. Also, 1
In the case of providing two heating elements, it is sufficient to fold the heating wire around one mica plate in the left-right direction and to increase the number of turns of the heating wire on the door side.Furthermore, in the above embodiment, Although the planar heater 4 is provided on the inner bottom surface of the heating cooking chamber, it may be provided on the upper surface or the inner surface instead.

[Effects of the Invention] As is clear from the above description, the present invention is configured such that the number of turns of the heating wire of the flat heater is increased on the door side, so that the temperature distribution in the heating cooking chamber becomes almost uniform. It has the excellent effect of uniformly heating the food and preventing uneven cooking as much as possible.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the planar heater with the top cover removed, FIG. 2 is a partially exploded perspective view of the planar heater, and FIG. 3 is a partially exploded perspective view of the planar heater. An exploded longitudinal cross-sectional side view showing the structure of the planar heater. In the drawing, 4 indicates a planar heater, 11.13 a mica plate (insulating substrate), and 12.14 a heating wire. Diagram

Claims (1)

[Claims] 1. Equipped with a heating cooking chamber having a door that opens and closes the front opening, and a planar heater arranged along the front-rear direction on the inner surface of the heating cooking chamber and configured by winding a heating wire around an insulating substrate. In the heating cooking device, the number of turns of the heating wire in the planar heater is increased on the door side.